Current Sensor Shield Segmentation for Noise Isolation
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Solution Overview
Problem
Current current sensors face challenges in accurately detecting measurement currents due to electromagnetic noise interference, which can lead to magnetic saturation and degradation of detection accuracy.
Innovation Solution
A current sensor design incorporating an electrical-conduction member, a magnetoelectric converter, and a shield with a first and second shield of plate shape, where the electrical-conduction member and magnetoelectric converter are positioned between the shields, and the second shield has extending parts that direct electromagnetic noise towards the first shield, minimizing permeation through the magnetoelectric converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic shielding is enhanced to suppress noise, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The shield is divided into multiple segments including a first shield, a second shield, and multiple extending parts. This segmentation allows the shield to effectively block electromagnetic noise from different directions while maintaining a manageable structural complexity through modular design
Solution Approach 2:
The extending parts of the second shield protrude toward the first shield, creating a three-dimensional shielding structure. This dimensional addition enhances noise suppression capability by blocking noise paths from multiple angles without requiring a complete enclosure
2Measurement precision
If the magnetoelectric converter is isolated from electromagnetic noise, then detection accuracy is improved, but the device structure becomes more complex
Solution Approach 1:
The shield structure acts as an intermediary between the magnetoelectric converter and external electromagnetic noise. The extending parts of the second shield create a protective barrier that mediates the interaction between noise and the converter, allowing effective isolation without requiring the converter itself to be modified
Solution Approach 2:
The magnetoelectric converter is positioned within the protective space formed by the nested shield structure. The first shield and second shield with extending parts create a nested configuration that houses the converter, providing isolation while maintaining a compact overall structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses electromagnetic noise leakage, reducing magnetic saturation and enhancing the detection accuracy of measurement currents by isolating the magnetoelectric converter from noise, thereby improving the overall performance of the current sensor.
Implementation Method 1
a magnetoelectric converter that converts a measurement magnetic field caused by a flow of the measurement current into an electric signal
Implementation Method 2
a shield that restricts an electromagnetic noise into the magnetoelectric converter
Data Source
AI summary
A current sensor includes an electrical-conduction member, a magnetoelectric converter and a shield. The shield includes a first shield and a second shield arranged such that surfaces are opposed to and spaced away from each other. A part of the electrical-conduction member and the magnetoelectric converter are located between the surface of the first shield and the surface of the second shield. The part of the electrical-conduction member located between the first shield and the second shield extends in an extension direction along the surface of the second shield. The second shield has two sides aligned in a lateral direction perpendicular to the extension direction, and has a plurality of extending parts extending toward the first shield at the sides and being aligned with and separated from each other in the extension direction. The magnetoelectric converter is located between the plurality of extending parts.